nit

.github/workflows/ghcr-publish.yml

@@ -18,6 +18,7 @@ on:
 env:
   # Use docker.io for Docker Hub if empty
   REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
 
 
 jobs:
@@ -36,19 +37,13 @@ jobs:
         with:
           submodules: 'true'
       
-      - name: Prepare
-        id: prep
-        run: |
-          DOCKER_IMAGE=${REGISTRY}/${{ github.repository_owner }}/sourcebot
-          VERSION=latest
-          if [[ $GITHUB_REF == refs/tags/* ]]; then
-            VERSION=${GITHUB_REF#refs/tags/v}
-          fi
-          TAGS="${DOCKER_IMAGE}:${VERSION}"
-          if [[ $VERSION =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
-            TAGS="$TAGS,${DOCKER_IMAGE}:latest"
-          fi
-          echo ::set-output name=tags::${TAGS}
+      # Extract metadata (tags, labels) for Docker
+      # https://github.com/docker/metadata-action
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
 
       # Install the cosign tool except on PR
       # https://github.com/sigstore/cosign-installer
@@ -79,7 +74,8 @@ jobs:
           push: ${{ github.event_name != 'pull_request' }}
           platforms: linux/amd64,linux/arm64
           file: ./Dockerfile
-          tags: ${{ steps.prep.outputs.tags }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
       
       # Sign the resulting Docker image digest except on PRs.
       # This will only write to the public Rekor transparency log when the Docker